It's not favorable. Ink costs for the 2400 are considerably higher.
For one thing, the cartridges are more expensive, second, there is
an additional cartridge; third (and this is still not confirmed)
there may be a bit less ink in the 2400 carts than in the 2200.

On the other hand, the 4800 carts are exactly the same price as the
4000 carts. There's still that additional black being used, but ink
costs for the 4800 should be pretty close to those for the 4000.

I would expect running costs to drop a bit.

The K3 printers are supposed to lean more heavily on the three blacks for the common (dark) portion of any color than the origional UltraChrome machines do. This should mean a little bit of LK or LLK is doing what Epson used to use a lot of C, LC, M, LM, and Y to do.

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